Mangrove Swallow
Tachycineta albilinea
A relatively small swallow, the mangrove swallow is 11–12 centimetres (4.3–4.7 in) long and weighs about 14 grams (0.5 oz). The adult has iridescent blue-green upperparts, white underparts, rump, and undertail- and wing-coverts, and blackish tail and flight feathers. The feathers are greener when fresh and bluer when worn. The white underparts sometimes have faint, dark shaft streaks. The bill is small and black, about 11 millimetres (0.43 in) long. The iris is a dark brown, and the tarsus and toes range in colour from black to fuscous-brown.
ID text from Wikipedia, CC BY-SA 4.0
White-rumped Swallow
Tachycineta leucorrhoa
The white-rumped swallow measures 13 centimetres (5.1 in) in length and weighs 17–21 grams (0.60–0.74 oz). It has an average wingspan of 115.7 millimetres (4.56 in). It has a white supraloral streak, a white streak above its eye, and black lores and ear coverts. The lores and ear-coverts have a blue-green gloss. It has black wings, with white tips on its inner secondaries, tertials, and greater wing-coverts. The white tips erode with age. The tail is black and has a shallow fork. The white-rumped swallow also has, as the name implies, a white rump.
ID text from Wikipedia, CC BY-SA 4.0
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